Like we see in this example:

http://research.bowdoin.edu/forty-years-the-history-of-women-at-bowdoin/process-of-coeducation/interview-with-saddie-smith-75/

[mp3j track=”http://bowdoin.edu/gender-women/audio/saddie-smith-75-interview-steph-bond-part-1.mp3″]

code looks like this
[mp3j track=”http://bowdoin.edu/gender-women/audio/saddie-smith-75-interview-steph-bond-part-1.mp3″]